This means that 'button_value' 0 is tied to "X1". In the same manner, bv 1 is tied to X2, bv 2 is tied to Y1, bv 3 is tied to Y2, and so on. POVs are also tied to button values 0-3 since they both control direction (analog sticks or d-pad). Throttles and sliders look mapped to bv 10-13 and face buttons to bv 16 and up.

_________________皆黙って俺について来い！！

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<jmr> bsnes has the most accurate wiki page but it takes forever to load (or something)